770 lines
20 KiB
C
770 lines
20 KiB
C
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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#include <ngx_event_pipe.h>
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static int ngx_event_pipe_read_upstream(ngx_event_pipe_t *p);
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static int ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p);
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static int ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p);
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ngx_inline static void ngx_event_pipe_remove_shadow_links(ngx_hunk_t *hunk);
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ngx_inline static void ngx_event_pipe_free_shadow_raw_hunk(ngx_chain_t **free,
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ngx_hunk_t *h);
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ngx_inline static void ngx_event_pipe_add_free_hunk(ngx_chain_t **chain,
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ngx_chain_t *cl);
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static int ngx_event_pipe_drain_chains(ngx_event_pipe_t *p);
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int ngx_event_pipe(ngx_event_pipe_t *p, int do_write)
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{
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u_int flags;
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ngx_event_t *rev, *wev;
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for ( ;; ) {
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if (do_write) {
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if (ngx_event_pipe_write_to_downstream(p) == NGX_ABORT) {
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return NGX_ABORT;
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}
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}
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p->read = 0;
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p->upstream_blocked = 0;
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if (ngx_event_pipe_read_upstream(p) == NGX_ABORT) {
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return NGX_ABORT;
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}
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if (!p->read && !p->upstream_blocked) {
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break;
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}
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do_write = 1;
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}
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if (p->upstream->fd != -1) {
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rev = p->upstream->read;
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flags = (rev->eof || rev->error) ? NGX_CLOSE_EVENT : 0;
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if (ngx_handle_read_event(rev, flags) == NGX_ERROR) {
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return NGX_ABORT;
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}
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if (rev->active) {
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ngx_add_timer(rev, p->read_timeout);
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}
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}
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if (p->downstream->fd != -1) {
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wev = p->downstream->write;
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wev->available = p->send_lowat;
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if (ngx_handle_write_event(wev, NGX_LOWAT_EVENT) == NGX_ERROR) {
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return NGX_ABORT;
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}
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if (wev->active) {
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ngx_add_timer(wev, p->send_timeout);
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}
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}
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return NGX_OK;
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}
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int ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
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{
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int n, rc, size;
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ngx_hunk_t *h;
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ngx_chain_t *chain, *cl, *tl;
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if (p->upstream_eof || p->upstream_error || p->upstream_done) {
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return NGX_OK;
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}
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe read upstream: %d", p->upstream->read->ready);
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for ( ;; ) {
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if (p->upstream_eof || p->upstream_error || p->upstream_done) {
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break;
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}
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if (p->preread_hunks == NULL && !p->upstream->read->ready) {
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break;
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}
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if (p->preread_hunks) {
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/* use the pre-read hunks if they exist */
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p->read = 1;
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chain = p->preread_hunks;
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p->preread_hunks = NULL;
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n = p->preread_size;
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe preread: %d", n);
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} else {
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/*
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* kqueue notifies about the end of file or a pending error.
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* This test allows not to allocate a hunk on these conditions
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* and not to call ngx_recv_chain().
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*/
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if (p->upstream->read->available == 0
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&& (p->upstream->read->kq_eof || p->upstream->read->aio_eof))
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{
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p->upstream->read->ready = 0;
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p->upstream->read->eof = 0;
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p->upstream_eof = 1;
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p->read = 1;
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#if (HAVE_KQUEUE)
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if (p->upstream->read->kq_errno) {
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p->upstream->read->error = 1;
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p->upstream_error = 1;
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p->upstream_eof = 0;
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ngx_log_error(NGX_LOG_ERR, p->log,
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p->upstream->read->kq_errno,
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"readv() failed");
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}
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#endif
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break;
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}
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if (p->free_raw_hunks) {
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/* use the free hunks if they exist */
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chain = p->free_raw_hunks;
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if (p->single_buf) {
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p->free_raw_hunks = p->free_raw_hunks->next;
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chain->next = NULL;
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} else {
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p->free_raw_hunks = NULL;
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}
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} else if (p->hunks < p->bufs.num) {
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/* allocate a new hunk if it's still allowed */
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ngx_test_null(h, ngx_create_temp_hunk(p->pool, p->bufs.size),
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NGX_ABORT);
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p->hunks++;
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ngx_alloc_link_and_set_hunk(tl, h, p->pool, NGX_ABORT);
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chain = tl;
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} else if (!p->cachable && p->downstream->write->ready) {
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/*
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* if the hunks are not needed to be saved in a cache and
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* a downstream is ready then write the hunks to a downstream
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*/
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p->upstream_blocked = 1;
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe downstream ready");
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break;
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} else if (p->cachable
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|| p->temp_file->offset < p->max_temp_file_size)
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{
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/*
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* if it's allowed then save some hunks from r->in
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* to a temporary file, and add them to a r->out chain
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*/
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rc = ngx_event_pipe_write_chain_to_temp_file(p);
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe temp offset: %d", p->temp_file->offset);
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if (rc == NGX_AGAIN) {
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if (ngx_event_flags & NGX_USE_LEVEL_EVENT
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&& p->upstream->read->active
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&& p->upstream->read->ready)
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{
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if (ngx_del_event(p->upstream->read, NGX_READ_EVENT, 0)
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== NGX_ERROR)
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{
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return NGX_ABORT;
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}
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}
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}
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if (rc != NGX_OK) {
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return rc;
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}
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chain = p->free_raw_hunks;
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if (p->single_buf) {
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p->free_raw_hunks = p->free_raw_hunks->next;
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chain->next = NULL;
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} else {
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p->free_raw_hunks = NULL;
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}
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} else {
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/* if there're no hunks to read in then disable a level event */
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"no pipe hunks to read in");
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break;
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}
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n = ngx_recv_chain(p->upstream, chain);
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe recv chain: %d", n);
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if (p->free_raw_hunks) {
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chain->next = p->free_raw_hunks;
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}
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p->free_raw_hunks = chain;
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if (n == NGX_ERROR) {
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p->upstream_error = 1;
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return NGX_ERROR;
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}
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if (n == NGX_AGAIN) {
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if (p->single_buf) {
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ngx_event_pipe_remove_shadow_links(chain->hunk);
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}
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break;
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}
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p->read = 1;
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if (n == 0) {
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p->upstream_eof = 1;
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break;
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}
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}
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p->read_length += n;
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cl = chain;
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while (cl && n > 0) {
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ngx_event_pipe_remove_shadow_links(cl->hunk);
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size = cl->hunk->end - cl->hunk->last;
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if (n >= size) {
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cl->hunk->last = cl->hunk->end;
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/* STUB */ cl->hunk->num = p->num++;
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if (p->input_filter(p, cl->hunk) == NGX_ERROR) {
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return NGX_ABORT;
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}
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n -= size;
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cl = cl->next;
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} else {
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cl->hunk->last += n;
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n = 0;
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}
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}
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p->free_raw_hunks = cl;
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}
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if ((p->upstream_eof || p->upstream_error) && p->free_raw_hunks) {
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/* STUB */ p->free_raw_hunks->hunk->num = p->num++;
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if (p->input_filter(p, p->free_raw_hunks->hunk) == NGX_ERROR) {
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return NGX_ABORT;
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}
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p->free_raw_hunks = p->free_raw_hunks->next;
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if (p->free_bufs) {
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for (cl = p->free_raw_hunks; cl; cl = cl->next) {
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ngx_pfree(p->pool, cl->hunk->start);
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}
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}
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}
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if (p->cachable && p->in) {
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if (ngx_event_pipe_write_chain_to_temp_file(p) == NGX_ABORT) {
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return NGX_ABORT;
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}
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}
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return NGX_OK;
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}
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int ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p)
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{
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size_t bsize, to_write;
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ngx_hunk_t *h;
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ngx_chain_t *out, **ll, *cl, *tl;
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe write downstream: %d", p->downstream->write->ready);
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for ( ;; ) {
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if (p->downstream_error) {
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return ngx_event_pipe_drain_chains(p);
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}
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if (p->upstream_eof || p->upstream_error || p->upstream_done) {
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/* pass the p->out and p->in chains to the output filter */
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if (p->out) {
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe write downstream flush out");
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if (p->output_filter(p->output_ctx, p->out) == NGX_ERROR) {
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p->downstream_error = 1;
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return ngx_event_pipe_drain_chains(p);
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}
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p->out = NULL;
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}
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if (p->in) {
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe write downstream flush in");
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if (p->output_filter(p->output_ctx, p->in) == NGX_ERROR) {
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p->downstream_error = 1;
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return ngx_event_pipe_drain_chains(p);
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}
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p->in = NULL;
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}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe write downstream done");
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/* TODO: free unused hunks */
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p->downstream_done = 1;
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break;
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}
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if (!p->downstream->write->ready) {
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break;
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}
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/*
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* bsize is the size of the busy hunks,
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* to_write is the size of data in these hunks that
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* would be written to a socket
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*/
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bsize = 0;
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to_write = 0;
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#if 0
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if (!(p->upstream_eof || p->upstream_error || p->upstream_done)) {
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#endif
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for (cl = p->busy; cl; cl = cl->next) {
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bsize += cl->hunk->end - cl->hunk->start;
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to_write += ngx_hunk_size(cl->hunk);
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}
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#if 0
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}
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#endif
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out = NULL;
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ll = NULL;
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for ( ;; ) {
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if (p->out) {
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cl = p->out;
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#if 0
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if (!(p->upstream_eof || p->upstream_error || p->upstream_done)
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&& (bsize + ngx_hunk_size(cl->hunk) > p->busy_size))
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{
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break;
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}
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#else
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if (bsize + ngx_hunk_size(cl->hunk) > p->busy_size) {
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break;
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}
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#endif
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p->out = p->out->next;
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ngx_event_pipe_free_shadow_raw_hunk(&p->free_raw_hunks,
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cl->hunk);
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} else if (!p->cachable && p->in) {
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cl = p->in;
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#if 0
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if (!(p->upstream_eof || p->upstream_error || p->upstream_done)
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&& (bsize + ngx_hunk_size(cl->hunk) > p->busy_size))
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{
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break;
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}
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#else
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if (bsize + ngx_hunk_size(cl->hunk) > p->busy_size) {
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break;
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}
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#endif
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p->in = p->in->next;
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} else {
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break;
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}
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bsize += ngx_hunk_size(cl->hunk);
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cl->next = NULL;
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ngx_chain_add_link(out, ll, cl);
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}
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if (out == NULL) {
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe busy hunk data to write: %d", to_write);
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if (!(p->upstream_blocked && to_write)) {
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break;
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}
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}
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/*
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* if the upstream is blocked and there are the busy hunks
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* to write then write these hunks
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*/
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if (p->output_filter(p->output_ctx, out) == NGX_ERROR) {
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p->downstream_error = 1;
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return ngx_event_pipe_drain_chains(p);
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}
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ngx_chain_update_chains(&p->free, &p->busy, &out, p->tag);
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for (cl = p->free; cl; cl = cl->next) {
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if (cl->hunk->type & NGX_HUNK_TEMP_FILE) {
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if (p->cachable || !p->cyclic_temp_file) {
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continue;
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}
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/* reset p->temp_offset if all hunks had been sent */
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if (cl->hunk->file_last == p->temp_file->offset) {
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p->temp_file->offset = 0;
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}
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}
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/* TODO: free hunk if p->free_bufs && upstream done */
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/* add the free shadow raw hunk to p->free_raw_hunks */
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if (cl->hunk->type & NGX_HUNK_LAST_SHADOW) {
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h = cl->hunk->shadow;
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h->pos = h->last = h->start;
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h->shadow = NULL;
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ngx_alloc_link_and_set_hunk(tl, h, p->pool, NGX_ABORT);
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ngx_event_pipe_add_free_hunk(&p->free_raw_hunks, tl);
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cl->hunk->type &= ~NGX_HUNK_LAST_SHADOW;
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}
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cl->hunk->shadow = NULL;
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#if 0
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if (p->cyclic_temp_file && (cl->hunk->type & NGX_HUNK_TEMP_FILE)) {
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/* reset p->temp_offset if all hunks had been sent */
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if (cl->hunk->file_last == p->temp_file->offset) {
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p->temp_file->offset = 0;
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}
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}
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#endif
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}
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}
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return NGX_OK;
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}
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static int ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p)
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{
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int size, hsize;
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ngx_hunk_t *h;
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ngx_chain_t *cl, *tl, *next, *out, **ll, **last_free, fl;
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if (p->hunk_to_file) {
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fl.hunk = p->hunk_to_file;
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fl.next = p->in;
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out = &fl;
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} else {
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out = p->in;
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}
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if (!p->cachable) {
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size = 0;
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cl = out;
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ll = NULL;
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe offset: %d", p->temp_file->offset);
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do {
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hsize = cl->hunk->last - cl->hunk->pos;
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
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"pipe hunk size: %d", hsize);
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if ((size + hsize > p->temp_file_write_size)
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|| (p->temp_file->offset + size + hsize > p->max_temp_file_size))
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{
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break;
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}
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size += hsize;
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ll = &cl->next;
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cl = cl->next;
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} while (cl);
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "size: %d", size);
|
|
|
|
if (cl) {
|
|
p->in = cl;
|
|
*ll = NULL;
|
|
|
|
} else {
|
|
p->in = NULL;
|
|
p->last_in = &p->in;
|
|
}
|
|
|
|
} else {
|
|
p->in = NULL;
|
|
p->last_in = &p->in;
|
|
}
|
|
|
|
if (ngx_write_chain_to_temp_file(p->temp_file, out) == NGX_ERROR) {
|
|
return NGX_ABORT;
|
|
}
|
|
|
|
for (last_free = &p->free_raw_hunks;
|
|
*last_free != NULL;
|
|
last_free = &(*last_free)->next)
|
|
{
|
|
/* void */
|
|
}
|
|
|
|
if (p->hunk_to_file) {
|
|
p->temp_file->offset = p->hunk_to_file->last - p->hunk_to_file->pos;
|
|
p->hunk_to_file = NULL;
|
|
out = out->next;
|
|
}
|
|
|
|
for (cl = out; cl; cl = next) {
|
|
next = cl->next;
|
|
cl->next = NULL;
|
|
|
|
h = cl->hunk;
|
|
h->file = &p->temp_file->file;
|
|
h->file_pos = p->temp_file->offset;
|
|
p->temp_file->offset += h->last - h->pos;
|
|
h->file_last = p->temp_file->offset;
|
|
|
|
h->type |= NGX_HUNK_FILE|NGX_HUNK_TEMP_FILE;
|
|
|
|
#if 0
|
|
if (p->cachable) {
|
|
h->type |= NGX_HUNK_FILE;
|
|
} else {
|
|
h->type |= NGX_HUNK_FILE|NGX_HUNK_TEMP_FILE;
|
|
}
|
|
#endif
|
|
|
|
ngx_chain_add_link(p->out, p->last_out, cl);
|
|
|
|
if (h->type & NGX_HUNK_LAST_SHADOW) {
|
|
h->shadow->last = h->shadow->pos = h->shadow->start;
|
|
ngx_alloc_link_and_set_hunk(tl, h->shadow, p->pool, NGX_ABORT);
|
|
*last_free = tl;
|
|
last_free = &tl->next;
|
|
}
|
|
}
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
|
|
/* the copy input filter */
|
|
|
|
int ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_hunk_t *hunk)
|
|
{
|
|
ngx_hunk_t *h;
|
|
ngx_chain_t *cl;
|
|
|
|
if (hunk->pos == hunk->last) {
|
|
return NGX_OK;
|
|
}
|
|
|
|
if (p->free) {
|
|
h = p->free->hunk;
|
|
p->free = p->free->next;
|
|
|
|
} else {
|
|
ngx_test_null(h, ngx_alloc_hunk(p->pool), NGX_ERROR);
|
|
}
|
|
|
|
ngx_memcpy(h, hunk, sizeof(ngx_hunk_t));
|
|
h->shadow = hunk;
|
|
h->tag = p->tag;
|
|
h->type |= NGX_HUNK_LAST_SHADOW|NGX_HUNK_RECYCLED;
|
|
hunk->shadow = h;
|
|
|
|
ngx_alloc_link_and_set_hunk(cl, h, p->pool, NGX_ERROR);
|
|
|
|
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "hunk #%d", h->num);
|
|
|
|
ngx_chain_add_link(p->in, p->last_in, cl);
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
|
|
ngx_inline static void ngx_event_pipe_remove_shadow_links(ngx_hunk_t *hunk)
|
|
{
|
|
ngx_hunk_t *h, *next;
|
|
|
|
if (hunk->shadow == NULL) {
|
|
return;
|
|
}
|
|
|
|
h = hunk->shadow;
|
|
|
|
while (!(h->type & NGX_HUNK_LAST_SHADOW)) {
|
|
next = h->shadow;
|
|
h->type &= ~(NGX_HUNK_TEMP|NGX_HUNK_IN_MEMORY|NGX_HUNK_RECYCLED);
|
|
h->shadow = NULL;
|
|
h = next;
|
|
}
|
|
|
|
h->type &= ~(NGX_HUNK_TEMP
|
|
|NGX_HUNK_IN_MEMORY
|
|
|NGX_HUNK_RECYCLED
|
|
|NGX_HUNK_LAST_SHADOW);
|
|
h->shadow = NULL;
|
|
|
|
hunk->shadow = NULL;
|
|
}
|
|
|
|
|
|
ngx_inline static void ngx_event_pipe_free_shadow_raw_hunk(ngx_chain_t **free,
|
|
ngx_hunk_t *h)
|
|
{
|
|
ngx_hunk_t *s;
|
|
ngx_chain_t *cl, **ll;
|
|
|
|
if (h->shadow == NULL) {
|
|
return;
|
|
}
|
|
|
|
for (s = h->shadow; !(s->type & NGX_HUNK_LAST_SHADOW); s = s->shadow) {
|
|
/* void */
|
|
}
|
|
|
|
ll = free;
|
|
|
|
for (cl = *free ; cl; cl = cl->next) {
|
|
if (cl->hunk == s) {
|
|
*ll = cl->next;
|
|
break;
|
|
}
|
|
|
|
if (cl->hunk->shadow) {
|
|
break;
|
|
}
|
|
|
|
ll = &cl->next;
|
|
}
|
|
}
|
|
|
|
|
|
ngx_inline static void ngx_event_pipe_add_free_hunk(ngx_chain_t **chain,
|
|
ngx_chain_t *cl)
|
|
{
|
|
if (*chain == NULL) {
|
|
*chain = cl;
|
|
return;
|
|
}
|
|
|
|
if ((*chain)->hunk->pos != (*chain)->hunk->last) {
|
|
cl->next = (*chain)->next;
|
|
(*chain)->next = cl;
|
|
|
|
} else {
|
|
cl->next = (*chain);
|
|
(*chain) = cl;
|
|
}
|
|
}
|
|
|
|
|
|
static int ngx_event_pipe_drain_chains(ngx_event_pipe_t *p)
|
|
{
|
|
ngx_hunk_t *h;
|
|
ngx_chain_t *cl, *tl;
|
|
|
|
for ( ;; ) {
|
|
if (p->busy) {
|
|
cl = p->busy;
|
|
p->busy = NULL;
|
|
|
|
} else if (p->out) {
|
|
cl = p->out;
|
|
p->out = NULL;
|
|
|
|
} else if (p->in) {
|
|
cl = p->in;
|
|
p->in = NULL;
|
|
|
|
} else {
|
|
return NGX_OK;
|
|
}
|
|
|
|
while (cl) {
|
|
if (cl->hunk->type & NGX_HUNK_LAST_SHADOW) {
|
|
h = cl->hunk->shadow;
|
|
h->pos = h->last = h->start;
|
|
h->shadow = NULL;
|
|
ngx_alloc_link_and_set_hunk(tl, h, p->pool, NGX_ABORT);
|
|
ngx_event_pipe_add_free_hunk(&p->free_raw_hunks, tl);
|
|
|
|
cl->hunk->type &= ~NGX_HUNK_LAST_SHADOW;
|
|
}
|
|
|
|
cl->hunk->shadow = NULL;
|
|
tl = cl->next;
|
|
cl->next = p->free;
|
|
p->free = cl;
|
|
cl = tl;
|
|
}
|
|
}
|
|
}
|